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/usr/share/pythia8-examples/examples/main84.cmnd is in pythia8-examples 8.1.86-1.

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! main84.cmnd.
! This file contains commands to be read in for a Pythia8 run.
! Lines not beginning with a letter or digit are comments.

// specify statistics parameters
Main:numberOfEvents      = 100  // number of events generated

// specify shower options
SpaceShower:MEafterFirst = off
TimeShower:MEafterFirst  = off

// specify merging options
Merging:doMGMerging      = on
Merging:Process          = pp>e+ve
Merging:TMS              = 30.
Merging:nJetMax          = 2

// specify PDF set
PDF:useLHAPDF            = on
PDF:LHAPDFset            = cteq6ll.LHpdf